5 1

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4_1

5_2

Contents

Image:5 1.gif
(KnotPlot image)

See the full Rolfsen Knot Table.

Visit 5 1's page at the Knot Server (KnotPlot driven, includes 3D interactive images!)

Visit 5_1's page at Knotilus!

Visit 5 1's page at the original Knot Atlas!

Known variously as "The Cinquefoil Knot", after certain herbs and shrubs of the rose family which have 5-lobed leaves and 5-petaled flowers (see e.g. [4]), as "The Pentafoil Knot" (visit Bert Jagers' pentafoil page), as the "Double Overhand Knot", as 5_1, and finally as the torus knot T(5,2).


A kolam of a 2x3 dot array
A kolam of a 2x3 dot array
The VISA Interlink Logo [1]
The VISA Interlink Logo [1]
The US bicentennial logo on a shirt seen in Lisboa [2]
The US bicentennial logo on a shirt seen in Lisboa [2]
A pentagonal table by Bob Mackay [3]
A pentagonal table by Bob Mackay [3]
The Utah State Parks logo
The Utah State Parks logo

This sentence was last edited by Dror. Sometime later, Scott added this sentence.

[edit] Knot presentations

Planar diagram presentation X1627 X3849 X5,10,6,1 X7283 X9,4,10,5
Gauss code -1, 4, -2, 5, -3, 1, -4, 2, -5, 3
Dowker-Thistlethwaite code 6 8 10 2 4
Conway Notation [5]


Minimum Braid Representative A Morse Link Presentation An Arc Presentation
Image:BraidPart3.gifImage:BraidPart3.gifImage:BraidPart3.gifImage:BraidPart3.gifImage:BraidPart3.gif
Image:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart4.gifImage:BraidPart4.gif

Length is 5, width is 2,

Braid index is 2

Image:5 1_ML.gif Image:5 1_AP.gif
[{7, 2}, {1, 3}, {2, 4}, {3, 5}, {4, 6}, {5, 7}, {6, 1}]

[edit Notes on presentations of 5 1]

Knot 5_1.
Knot 5_1.
A graph, knot 5_1.
A graph, knot 5_1.

[edit] Three dimensional invariants

Symmetry type Reversible
Unknotting number 2
3-genus 2
Bridge index 2
Super bridge index 3
Nakanishi index 1
Maximal Thurston-Bennequin number [-10][3]
Hyperbolic Volume Not hyperbolic
A-Polynomial See Data:5 1/A-polynomial

[edit Notes for 5 1's three dimensional invariants]

[edit] Four dimensional invariants

Smooth 4 genus 2
Topological 4 genus 2
Concordance genus 2
Rasmussen s-Invariant -4

[edit Notes for 5 1's four dimensional invariants]

[edit] Polynomial invariants

Alexander polynomial t2t + 1−t−1 + t−2
Conway polynomial z4 + 3z2 + 1
2nd Alexander ideal (db, data sources) {1}
Determinant and Signature { 5, -4 }
Jones polynomial q−2 + q−4q−5 + q−6q−7
HOMFLY-PT polynomial (db, data sources) z2a6−2a6 + z4a4 + 4z2a4 + 3a4
Kauffman polynomial (db, data sources) za9 + z2a8 + z3a7za7 + z4a6−3z2a6 + 2a6 + z3a5−2za5 + z4a4−4z2a4 + 3a4
The A2 invariant q22q20q18 + q14 + q12 + 2q10 + q8 + q6
The G2 invariant q120q100q98q92q90q88q82q80q78q72 + q58 + q56 + q52 + 2q50 + q48 + q46 + q44 + q42 + 2q40 + q38 + q34 + q32 + q30

[edit] "Similar" Knots (within the Atlas)

Same Alexander/Conway Polynomial: {10_132,}

Same Jones Polynomial (up to mirroring, q\leftrightarrow q^{-1}): {10_132,}

[edit] Vassiliev invariants

V2 and V3: (3, -5)

[edit] Khovanov Homology

The coefficients of the monomials trqj are shown, along with their alternating sums χ (fixed j, alternation over r). The squares with yellow highlighting are those on the "critical diagonals", where j−2r = s + 1 or j−2r = s−1, where s = -4 is the signature of 5 1. Nonzero entries off the critical diagonals (if any exist) are highlighted in red.   
\ r
  \  
j \
-5-4-3-2-10χ
-3     11
-5     11
-7   1  1
-9      0
-11 11   0
-13      0
-151     -1
Integral Khovanov Homology

(db, data source)

  
\dim{\mathcal G}_{2r+i}\operatorname{KH}^r_{\mathbb Z} i = −5 i = −3
r = −5 {\mathbb Z}
r = −4 {\mathbb Z}_2 {\mathbb Z}
r = −3 {\mathbb Z}
r = −2 {\mathbb Z}_2 {\mathbb Z}
r = −1
r = 0 {\mathbb Z} {\mathbb Z}

[edit] The Coloured Jones Polynomials

[edit] Computer Talk

Much of the above data can be recomputed by Mathematica using the package KnotTheory`. See A Sample KnotTheory` Session, or any of the Computer Talk sections above.

[edit] Modifying This Page

Read me first: Modifying Knot Pages

See/edit the Rolfsen Knot Page master template (intermediate).

See/edit the Rolfsen_Splice_Base (expert).

Back to the top.

4_1

5_2

Retrieved from "http://katlas.org/wiki/5_1"
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